diff --git a/lib/csharp/src/TApplicationException.cs b/lib/csharp/src/TApplicationException.cs
new file mode 100644
index 0000000..e4f3acf
--- /dev/null
+++ b/lib/csharp/src/TApplicationException.cs
@@ -0,0 +1,127 @@
+//
+//  TApplicationException.cs
+//
+//  Begin:  Aug 19, 2007
+//  Authors: 
+//		Todd Berman <tberman@imeem.com>
+//
+//  Distributed under the Thrift Software License
+//
+//  See accompanying file LICENSE or visit the Thrift site at:
+//  http://developers.facebook.com/thrift/using
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Thrift.Protocol;
+
+namespace Thrift
+{
+	public class TApplicationException : Exception
+	{
+		protected ExceptionType type;
+
+		public TApplicationException()
+		{
+		}
+
+		public TApplicationException(ExceptionType type)
+		{
+			this.type = type;
+		}
+
+		public TApplicationException(ExceptionType type, string message)
+			: base(message)
+		{
+			this.type = type;
+		}
+
+		public static TApplicationException Read(TProtocol iprot)
+		{
+			TField field;
+			TStruct struc = iprot.ReadStructBegin();
+
+			string message = null;
+			ExceptionType type = ExceptionType.Unknown;
+
+			while (true)
+			{
+				field = iprot.ReadFieldBegin();
+				if (field.Type == TType.Stop)
+				{
+					break;
+				}
+
+				switch (field.ID)
+				{
+					case 1:
+						if (field.Type == TType.String)
+						{
+							message = iprot.ReadString();
+						}
+						else
+						{
+							TProtocolUtil.Skip(iprot, field.Type);
+						}
+						break;
+					case 2:
+						if (field.Type == TType.I32)
+						{
+							type = (ExceptionType)iprot.ReadI32();
+						}
+						else
+						{
+							TProtocolUtil.Skip(iprot, field.Type);
+						}
+						break;
+					default:
+						TProtocolUtil.Skip(iprot, field.Type);
+						break;
+				}
+
+				iprot.ReadFieldEnd();
+			}
+
+			iprot.ReadStructEnd();
+
+			return new TApplicationException(type, message);
+		}
+
+		public void Write(TProtocol oprot)
+		{
+			TStruct struc = new TStruct("TApplicationException");
+			TField field = new TField();
+
+			oprot.WriteStructBegin(struc);
+
+			if (!String.IsNullOrEmpty(Message))
+			{
+				field.Name = "message";
+				field.Type = TType.String;
+				field.ID = 1;
+				oprot.WriteFieldBegin(field);
+				oprot.WriteString(Message);
+				oprot.WriteFieldEnd();
+			}
+
+			field.Name = "type";
+			field.Type = TType.I32;
+			field.ID = 2;
+			oprot.WriteFieldBegin(field);
+			oprot.WriteI32((int)type);
+			oprot.WriteFieldEnd();
+			oprot.WriteFieldStop();
+			oprot.WriteStructEnd();
+		}
+
+		public enum ExceptionType
+		{
+			Unknown,
+			UnknownMethod,
+			InvalidMessageType,
+			WrongMethodName,
+			BadSequenceID,
+			MissingResult
+		}
+	}
+}